This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 61 |
| 2 | 1441 |
| 3 | 17861 |
| 4 | 142001 |
| 5 | 819005 |
| 6 | 3713305 |
| 7 | 13980205 |
| 8 | 45432805 |
| 9 | 131091505 |
| 10 | 342981013 |
| 11 | 826861993 |
| 12 | 1859914733 |
| 13 | 3942293993 |
| 14 | 7937011013 |
| 15 | 15276834025 |
| 16 | 28261896025 |
| 17 | 50477521525 |
| 18 | 87368496025 |
| 19 | 147013666525 |
| 20 | 241153442041 |
| 21 | 386532523301 |
| 22 | 606631094081 |
| 23 | 933869816501 |